To reduce computational complexity, the system captures the key-frames in fixed time interval.

为了减少计算量，本文采取了固定时间间隔提取关键帧的办法。

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There is no fixed time interval before marriage that the premarital check-up has to be performed.

至于在婚前多久才须要做婚前检查，并无特定限制。

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There is no fixed time interval before marriage that the premarital check-up has to be performed.

至于在婚前多久才须要做婚前检查，并无特定限制。

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